I noticed too that I no longer felt like I was starving all the time. I haven't gained weight but I don't eat as much either so I think my metabolism slowed.
and testosterone does increase metabolism:
"basal metabolic rate (BMR) increased significantly after 3 months of testosterone treatment "
https://www.ncbi.nlm.nih.gov/m/pubmed/1730811/
"Testosterone and dehydroepiandrosterone stimulate RMR, in part, directly and, in part, through their effects on body composition (
30)."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2645618/
This is very bad because in nature creatures with slower metabolisms live longer. The more food required equals more toxic byproducts of metabolism. That's one main reason why calorie restriction extends lifespan. Amongst these similiar aged monkeys, the one on the right has restricted calories.
View attachment 120355
Also, CR slows metabolism. This is also why I believe too much muscle would also contribute to the aging process. Because bigger muscles consume more energy even while at rest. The more muscle one has, the more calories required to be able to maintain it which again leads to more toxic byproducts of metabolism; homocysteine, oxidation, glycation end products, etc.
Yet people get power and strength confused with health and longevity and the media glorifies testosterone. Women have less muscle and live longer than men, they also have slower metabolisms cause the reality is that the candle glowing twice as bright lasts half as long.